prefixation and suffixation are belong to affixation. And affixation is a part of word formation.
Prefixation do not generally chang the word-class of the stems but only modify the meaning. There are a few kinds of prefixes:
1. negative prefixs;
2. reversed prefixes: dis-:disallow; un-:unwrap; de:decentralize;
3.pejorative prefixes: mal-:maltreat; mis-:misconduct;
4.prefixes of degree or size: arch-:archbiship; extra-:extra-strong;
5.prefixes of orientation and attitude: anti-; contra-;
6.locative prefixes: inter-:interpersonal; intra-: intraparty;
7.prefixes of time and order: fore-;
8.number of prefixes: mono-; semi-;
9.miscellaneous prefixes: auto-; neo-: neo-Nazi;
suffixation mainly change the word calss(change the grammatical function of stems). The types of it are:
1.1 denominal nouns: -eer, -er;
1.2 adverbal nouns:1.2.1 V+the following suffixes:-ant, -ette, -let;
1.2.2 V+the following suffixes denoting action, result,process, state: -age, -ance, -sion
1.3 de-adjective nouns: -ity, -ness;
1.4 noun and adjective suffixes;
2.1 denominal suffixes: 2.1.1 N+ -ed, -ful, -ish,-less, -lile, -ly
2.1.2 Adj+ -ish, -ial, -al, -ical
2.2 deverbal suffixes: -able, -ible, -ive, -ative, -sive
2.3 adverb suffixes
2.4 berb suffixes: -ate, -en, -ify, -fy, -ize, -ise.
That is my note on MODERN ENGLISH LEXICOLOGY lesson. If you still have some difficults, you can have a look of the books about linguistics.